UPDATE: We just found from Adorama via eBay the Vizio M-Series 55-inch 4K Ultra HD Smart LED TV for $599 shipped (Orig. $1000). It has 5 HDMI and 1 USB port.
BuyDig via eBay has the Samsung (UN55KU6300) 55-inch Smart 4K UHD HDR LED TV for $769.99 shipped. That’s $429 off the original price, $128 less than Amazon and the lowest we can currently find for it. Not only does it have 4K display but it’s also powered by a Quad-Core Processor to deliver the latest Samsung Smart TV platform. It has 3 HDMI and 2 USB inputs and Amazon shoppers gave it 4.3/5 stars.
Also from BuyDig via eBay is the Sharp (LC-70UC30U) 4K 70-inch AQUOS Ultra HD LED Smart TV for $1,549 shipped. That’s $750 off the original list price, $451 less than Amazon and the lowest we’ve seen for it. This 4K TV has four times the resolution of standard HD and with Android TV you can watch a movie, listen to radio or use your favorite apps. There are 4 HDMI and 3 USB inputs to connect your peripherals.